Customers will be able to customise the filter's strength to suit their needs

BT's Pete Oliver said: "[We take] the issue of online child protection extremely seriously and we are very pleased to be able to launch the whole-home filter to help parents keep their families safe online.

"We've been focused on the issue of online safety since we developed the world's first Cleanfeed filter to block child abuse images and made the technology available free to other ISPs across the world a decade ago."

Current BT internet subscribers will be contacted in 2014 to establish whether they want to set the filters up on their accounts.